53 lines
1.9 KiB
Python
53 lines
1.9 KiB
Python
#!/usr/bin/env python3
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# Libervia: an XMPP client
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# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""tools to launch process in a async way (using Twisted)"""
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from collections import OrderedDict
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from typing import Optional, Callable, Awaitable
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from sat.core.log import getLogger
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log = getLogger(__name__)
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def async_lru(maxsize: Optional[int] = 50) -> Callable:
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"""Decorator to cache async function results using LRU algorithm
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@param maxsize: maximum number of items to keep in cache.
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None to have no limit
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"""
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def decorator(func: Callable) -> Callable:
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cache = OrderedDict()
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async def wrapper(*args) -> Awaitable:
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if args in cache:
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log.debug(f"using result in cache for {args}")
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cache.move_to_end(args)
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result = cache[args]
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return result
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log.debug(f"caching result for {args}")
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result = await func(*args)
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cache[args] = result
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if maxsize is not None and len(cache) > maxsize:
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value = cache.popitem(False)
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log.debug(f"Removing LRU value: {value}")
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return result
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return wrapper
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return decorator
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